.col-md-4{
    margin: 20px 0;
    .card{
        width: 350px;
        .card-img-top{
            line-height: 40px;
        }
        .card-body{
            h5{
                font-size: 18px;
                font-style: italic;//字体倾斜
            }
            .card-text{
                font-size: 14px;
                color: cornflowerblue;
                margin-bottom: 5px;
            }
            .card-area{
                font-size: 16px;
            }
            background-color: #f5f3f3;
            ul{
                list-style: none; 
            }
            .btn{
                margin-left: 40px;
                box-sizing: border-box;
                border-radius: 15px;
            }
        }
    }
    
}